<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录页面</h1>
<span style="color: red" th :text="${msg}"></span>
<form method="post" action="login.html">
  <input type="text" name="username" /><br>
  <input type="password" name="password" /><br>
  <input type="submit" name="submit" value="登录"/><br>
</form>
</body>
</html>